Re: NTSC Apple //e mainboard: Connectors?

["Michael J. Mahon" <mjmahon@aol.com>]

Linards Ticmanis wrote:
> Hello,
>
> now that just I got my NTSC pre-Platinum Apple //e mainboard from Bill
> Garber, maybe somebody around here could answer a few question about the
> connectors?
>
> 1.) Where do you connect the internal speaker? J18 in the front right
> corner or J19 in the middle of the right edge? Or somewhere else
> entirely? And what's the other one for?

J18 is the speaker connector.

J19 connects an optional switch used for keyboard character set
selection switch if bowtie X10 is cut.

> 2.) The keyboard socket wiring for this thing is the same as for the
> U.S. layout of the PAL model I hope?

Yes.

> 3.) I've heard that the keyboard ROM contains, in addition to the
> standard layout, a second "Dvorak" style layout which you can activate
> by attaching a switch in the right place. I'd like to know where you
> connect this switch, since I want to plug in my English/German keyboard
> ROM instead of the English/Dvorak one and then attach the switch that's
> already built into my PAL //e case for this purpose. I know that I'll
> need an adapter for the Video ROM.

J19 is the place!

> 4.) Slightly unrelated: what does the marking 5XB on an electrolytic
> capacitor mean? I assume it stands for some specific voltage and
> capacitance, but which? Just in case any of them are dead.

That's not a voltage or capacitance marking.  It is a manufacturer
marking--perhaps for manufacture date/run or "model".

Look elsewhere on the capacitor for the voltage rating and capacitance
value--it should be quite clear.

-michael

NadaNet networking for Apple II computers!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."